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Stockholders' Investment
 6 Months Ended
Jun. 30, 2016
Equity [Abstract]  
Stockholders' investment
6. Stockholders’ Investment
Changes in stockholders’ investment for the three and six months ended June 30, 2016 and 2015 consisted of the following (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
Beginning balance
$
557,471

 
$
537,053

 
$
556,439

 
$
524,287

Net (loss) income
(2,739
)
 
10,571

 
(1,839
)
 
20,391

Share-based compensation
577

 
825

 
1,126

 
1,621

Issuance of restricted stock units, net of taxes paid
(13
)
 
(22
)
 
(177
)
 
(861
)
Issuance of common stock from stock options
—

 
1,833

 
—

 
4,011

(Tax deficiency) excess tax benefit on share-based compensation
(32
)
 
380

 
(285
)
 
1,191

Ending balance
$
555,264

 
$
550,640

 
$
555,264

 
$
550,640